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 Instrumentation
About Instrumentation...
Laboratorio Elettrofisico Engineering designs and manufactures instrumentation, such as fluxmeters and gaussmeters, which are in continuous evolution to fit the technical needs of accuracy, with special regards to the reliability and the rapidity in the productive process.
 magnetism
conversion table
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Instrumentation » FLUXMETERS and ACCESSORIES
DIGITAL FLUXMETER 
The most advanced Fluxmeter available in the market for measurements of magnetic materials and circuits Calibration Certification Service, available from stock, high accuracy, RS 232 interface, digital display.
The most common magnetic field measurements to perform
using the fluxmeter are:
· Magnet working point measurement ·
· Residual induction measurement ·
· Magnet quality control ·
LATEST INSTRUMENT RELEASE
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• FAST MEASURING
• BACKLIGHTING DISPLAY
• AUTOMATIC PARAMETERS SETTING
• SUPERIOR BY DESIGN made in Italy
• EASILY OPERATING MENU
• AUTOMATIC DRIFT COMPENSATION |
FLUXMETER WORKING PRINCIPLE
The fluxmeter is a dynamic meter of the magnetic flux.
The fluxmeter is based on the electromagnetic induction principle: the magnetic flux variation during the time in a circuit produces a voltage V (induced):
Therefore it is possible to determine easily that the flux is equal to the integral of the voltage during the time:
Using the voltage generated to the terminals of a coil to supply an electronic integrator it is obtained a reading directly proportional to the linked flux.
From the induction law we see that is the variation of a magnetic flux that produces a voltage therefore the flux measurement using the fluxmeter must be performed in dynamic conditions either moving the measuring coil or varying and/or moving the field source.
Here below it is reported how to perform the most common measurements using the fluxmeter.
DATA SHEET
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Applications
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flux measurements in static or transient events
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permanent magnets in open circuit: measurement of intrinsic induction on working point (Jw ~= Br )
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soft magnetic materials: residual field testing
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BH curves measurement
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measurement of magnetic moment of permanent magnetism in open circuit
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strength field measurement (H) , also for fast transient events
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measurement of the flux generated by motors or other electromagnetic devices
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uniform and easily accessible magnetic field generator
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Controlling the quality of permanent magnets
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STANDARD HELMHOLTZ COILS
| HELMHOLTZ COIL |
HM/R15 |
| Kh constant |
4.5 • 10-6 m |
| measurement area |
dia. 12 mm (0.472") H 9 mm (0.354") |
| weight |
1,2 kg. |
| HELMHOLTZ COIL |
HM/R32 |
| Kh constant |
1.1 • 10-4 m |
| measurement area |
dia. 29 mm (1.141") H 19 mm (0.748") |
| weight |
4 kg. |
| HELMHOLTZ COIL |
HM/R58 |
| Kh constant |
4.5 • 10-4 m |
| measurement area |
dia. 53 mm (2.086") H 34 mm (1.338") |
| weight |
6 kg. |
| HELMHOLTZ COIL |
HM/R100 |
| Kh constant |
2.8 • 10-3 m |
| measurement area |
dia. 90 mm (3.543") H 60 mm (2.362") |
| weight |
10 kg. |
| HELMHOLTZ COIL |
HM/R150 |
| Kh constant |
7.3 • 10-3 m |
| measurement area |
dia. 135 mm (5.314") H 90 mm (3.543") |
| weight |
12 kg. |
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Customized Helmholtz Coils available on demand, 2 and 3 axis
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working points
Controlling the quality of permanent magnets
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MTC-1 Precision Volt-Second Generator
When the optimum performance of a measurement instrument is required, that instrument must be periodically calibrated to a traceable standard. This standard must provide a calibration accuracy which exceeds the intrinsic accuracy of the measurement instrument by a comfortable margin. A margin broad enough so as not to unduly influence the overall calibrated accuracy of that instrument.
The MTC-1 Volt-Second Generator is a precision traceable standard with 11 impulse outputs from 0.0001 V-S to 10 V-S, which corresponds to a range of 104 to 109 maxwell-turns, and has an overall instrument accuracy which is better than ±0.05%.
Used as a primary standard to calibrate fluxmeters, electronic integrators and ballistic galvonometers without recourse to standard search coils or reference magnets, the MTC-1 will calibrate a quality fluxmeter precisely enough to allow the fluxmeter to be used as a secondary standard for calibration of search coils, reference magnets, Hall probes and gaussmeters.
Features
- Trackable Accuracy: ±0.05%, NIST Traceability
- Broad Range: 0.0001 to 10 Volt-Seconds; 104 to 109 Maxwell-Turns
- Stand Alone Calibration: Without recourse to search coils or reference magnets
- Direct Calibration: Fluxmeters, Electronic Integrators, Ballistic Galvanometers
- Indirect Calibration: Gaussmeters, Hall-probes, Search Coils, Reference Magnets
- Convenient Scaling: Scaled to read Volt-Seconds and Kilomaxwell-Turns
Principles of Operation
Most fluxmeters measure the total change in flux of a changing magnetic field by integrating the voltage induced in a sensing coil. Each magnetic line, maxwell, in linking a conductor induces in it a 10-8 volt-second impulse.
From the physical relationship, 1 volt = 1 weber/second and 1 weber = 108 maxwell-turns, the MTC-1 volt-second generator becomes a standard by simulating maxwell-turns from the derived relationship 1 volt-second = 108 maxwell-turns.
The MTC-1 produces an output pulse with a calibrated height (voltage) and calibrated width (time), the integral of which is height x width or volt-seconds. This volt-second pulse becomes the source by which the fluxmeter is calibrated.
Two output voltages and seven time intervals are provided which produce 14 different volt-second combinations for 11 different maxwell outputs from 104 to 109 maxwell-turns.
A 1 volt base is regulated by a precision voltage regulator IC operating with a precision divider network to produce simultaneous 1 volt and 0.01 volt output pulses.
The time base for the MTC-1 is a 3.276 MHz crystal-controlled oscillator which is divided down and buffered to provide a 100 Hz TTL compatable clock signal to the output circuit. The overall accuracy of the time base is ±0.005%.
The timer turns on the output for 1 to 1000 clock pulses producing 104 to 107 maxwell-turns at the 0.01 Volt output or 106 to 109 maxwell-turns at the 1 volt output.
Specifications
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Range
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2 Voltage Ranges 0.01V, 1V ±0.01%
7 time intervals: 0.01, 0.05, 0.1, 0.5, 1, 5, 10 seconds ±0.005%
14 Volt-Second output pulses corresponding to 11 Maxwell-Turn ranges. From 0.0001 to 10 Volt-Seconds; 104 to 109 Maxwell-Turns
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Stability
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Voltage Base: ±0.004%/°C; ±0.01% @ 25 ±10°C
Time Base: ±0.005%; -25°C to 75°C
Divider Network: ±0.0002%/°C; ±0.002% @ 25 ±10°C
Volt-Second Product: ±0.0042%/°C, ±0.005%; ±0.047% @ 25 ±10°C
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Accuracy
(Factory Set)
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Calibration (set voltage): ±0.01%*
Volt-Second Product: ±0.03% @ 25°C
*Depends on voltage standard used
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Source
Resistance
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0.01V Range 0.2 ohm
1V Range 20.0 ohm
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Power
Input
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105 V - 125 V 50 Hz/60 Hz Std.
210 V - 250 V 50 Hz/60 Hz Opt.
Approx. 14 VA
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FLUX MEASURING SENSOR mod.LPH-P...
Custom measuring coils designed and built to measure magnetic flux with the Digital Flux instrument in any magnetic circuit.
| Customer dwg |
... |
| outside diameter |
50,5 mm |
| max. useful length |
60 mm |
| magnetic material |
ferrite |
| magnetic orientation |
radial |
| number of poles |
6 |
| magnet length |
54 mm |
This tensiometer match with the DIGITAL FLUXmeter. 
Controlling the quality of permanent magnets
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FLUX MEASURING SENSOR mod.LPH-200
Tensiometer for "H" measurements to be connected to the Digital Flux.
| magnetic area |
7.000 mm2 |
| dimensions |
L 80, W 8, H 2,5 mm |
| non-magnetic support |
LPS-200 (optional) |
This tensiometer match with the DIGITAL FLUXmeter.
Controlling the quality of permanent magnets
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Controlling the quality of permanent magnets
The fluxmeter is often used to control the quality of permanent magnets. The main reason is its versatility: it is possible to build wound fluxmetric coils that match perfectly any magnetic item to be measured. The same fluxmeter can measure a big variety of devices using the proper measuring coils.
Although there are devices than need an ‘ad hoc’ coil, there are some ‘universal’ coils suitable for wide ranges of shapes, dimensions, materials: it is the case of Helmholtz coils and potential coils.
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Helmholtz coils
Helmholtz coils are probably the most easy, fast and cheap way to control the quality of permanent magnets. They are made by two identical coaxial coils fixed at a distance equal to their radius. This configuration permits a wide uniformity volume inside the coil, guaranteeing a measure independent from positioning errors. The picture below shows the uniformity volume in a Helmholtz coil.
The measure with Helmholtz coils is described in the International Standard IEC 60404-14. |
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| The Helmholtz coil’s reading is proportional to the residual induction Br of the material (more precisely, to the magnetic polarisation of the working point Jd, see picture above). The measuring procedure, very simple, is quickly described below. |
| Jd is calculated by the read flux and the coil’s constant KH (that is given in the coil’s certificate) using the formula: |
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Potential coils
If H is a constant magnetic field between two points at a distance d, the difference of magnetic potential .gif) P between the two points is given by P = H•d.
The potential coils permit to measure easily the demagnetization field Hd of a permanent magnet through the measure of the magnetic potential. It is sufficient to know the thickness d of the magnet and make a measure of flux .gif) in its surface with the potential coil to calculate Hd: Hd = 2Kp•/d where Kp is the constant (certificate) of the potential coils. |
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Instrumentation » HELMHOLTZ COILS
Helmholtz Coils
The Helmholtz coil system concept, developed by a German physicist over a century ago, is a system that is normally used to generate magnetic field levels of specified volume and uniformity, allowing scientists and engineers to perform numerous experiments and test functions that require a known ambient magnetic field. Helmholtz field generation can be static, time-varying DC or AC, depending on applications.
Applications range from cancelling the earth's magnetic field for certain experiments as well as generating magnetic fields for applications such as determining magnetic shielding effectiveness, determining the susceptibility of electronic equipment to magnetic fields, calibration of magnetometers and navigational equipment and for many bio-magnetic studies, just to name a few.
Helmholtz coils can also be used to sense magnetic fields when coupled with an integrating fluxmeter. This becomes a convenient way to determine the open circuit intrinsic characteristics of permanent magnet materials.
Accessory equipment such as Walker gaussmeters and magnetometers are available for magnetic field verification or incorporated as part of a closed loop system. Walker fluxmeters are also widely used in the Helmholtz/fluxmeter magnet measurement systems.
Applications
- Radiated Magnetic Field Immunity Testing
- Susceptibility measurements
- Calibration for navigational equipment
- Permanent magnet inspection
- Earth's field cancellation for bio-magnetic studies, etc.
- Magnetometer calibration
- Magnetoresistance measurement
- Hall probe calibration
- CRT adjustments
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ROUND, SINGLE AXIS HELMHOLTZ
For susceptibility testing
ROUND, SINGLE AXIS HELMHOLTZ
With stand included as part of the coil design. |
The basic, typical single axis Helmholtz coil system consists of two identically wound layered coils, wired in series, with a specific geometry wherein the mean radius is equal to the mean coil spacing. When either AC or DC power is applied to this coil geometry, a magnetic field volume is produced in which uniform conditions exist. The strength of the magnetic field generated is directly proportional to the number of conductor turns in the coils, the applied current, the physical size and the intercoil spacing between the coils.
Coil configurations of greater complexity are sometimes necessary in order to accommodate a particular application. Systems that consist of two (biaxial) or three (triaxial) coil pairs are often required. Each coil pair or axis is usually independently controlled through a dedicated power supply. As a result, the magnetic vector generated by each coil pair can be regulated to complement other coil pairs in providing a desired uniformity over a specified sample volume or coil center line. Triaxial systems, for example, can be used to negate the effects of the earth's field (between 400-750 milligauss). |
ROUND, TRIAXIAL
HELMHOLTZ SYSTEM
With controller to test
magnetic compasses. |
Radiated Magnetic Field Immunity Testing
Walker LDJ Scientific is your source for producing magnetic fields for Radiated Field Immunity Testing per SAE J1113/22.
A recommended testing technique which produces a frequency dependent magnetic field intensity for determining the immunity of electronic devices to magnetic fields generated by power transmission lines and generating stations. Let our technical staff work with you to determine the most economical system to meet your particular requirements. The actual size of the Device Under Test (DUT) will determine the size and configuration of your coil system.
160 dBpt (100 µT) @ 60 Hz, decreasing at a rate of 12 dB/Octave for odd harmonics of 60 Hz up to 30 kHz |
ROUND, TRIAXIAL HELMHOLTZ SYSTEM
With built-in platform and closed loop, feedback system. |
ROUND, SINGLE AXIS, MULTI-COIL HELMHOLTZ
For high field, high uniformity space restricted application. |
SINGLE AXIS
SPLIT BASE HELMHOLTZ
Equipment testing for the
transportation industry.
Compliance with SAE J1113/22 |
SQUARE, TRIAXIAL
HELMHOLTZ COIL SYSTEM
Earth's field cancellation
for bio-magnetic studies. |
Helmholtz Design Requests
The combined values of Walker LDJ Scientific experience, reliability, quality and performance has resulted in the production of many proven AC and DC Helmholtz coil system designs. Single, biaxial or triaxial Helmholtz coils with single or multi-pair coil sets, fixed or rotatable, are offered in round, square or rectangular configurations. Field levels from the gamma range (1 gamma = 1 nT = 10-5 G) to the kilogauss level can be generated with uniformity in parts per million (ppm) over a specified sample volume.
Information related to any Helmholtz design request should be provided by completing the Helmholtz questionnaire and returning a copy of the completed form for processing.
All unusual installation constraints should be noted on the application.
With our unique engineering and design approach and our unique manufacturing techniques, Walker LDJ Scientific is able to provide cost effective systems with features that meet your exact application requirements.
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SQUARE, BOX TYPE,
TRIAXIAL HELMHOLTZ
Designed specifically for
CRT adjustments in the
manufacturing environment.
SQUARE, SINGLE AXIS,
MULTI-COIL HELMHOLTZ
Another concept of a
space-restricted application. |
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Instrumentation » GAUSSMETERS
DG series 5100
| FEATURES |
| -fully portable |
| -easy to use |
| -powerful instrument |
| -hand-held size |
| -the best accurcy in it's class |
| -data logging capability |
| -20x lower resolution |
| -Frequency Responce 2x better than competitor |
| -The only handheld meter with DSP |
| -Auto Zero |
| -Min/Max/Peak Hold |
| -Auto Range |
| -Relative Mode |
| -Universal Serial Bus Interface |
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| APPLICATIONS |
| -sorting or performing inspection or permanent magnets |
| -testing loudspeaker magnet assemblies |
| -testing trasformer lamination stacks, out toroidal cores,coils and solenoids |
| -determining the location of stray fields around medical diagnostic equipment |
| -locationg flaws in welded joints |
| -inspection of ferrous materials and magnetic recording head |
| -scanner system |
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GAUSSMETERS series 5100
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| SPECIFICATIONS |
DG 5170 |
DG 5180 |
| Basic accuracy |
2% |
1% |
| Frequency Bandwidth |
DC-20KHz |
DC-40KHz |
| Sampling Rate |
5/sec |
5/sec |
| Ranges |
Low range |
200 G |
300G |
| Mid range |
2KG |
3KG |
| Higth range |
20KG |
30KG |
| Resolution |
Low range |
0,1 G (10 uTesla) |
0,1 G (10 uTesla) |
| Mid range |
1 G (100 uTesla) |
1 G (100 uTesla) |
| Higth range |
10 G (1 mTesla) |
10 G (1 mTesla) |
| Display |
LCD |
LCD |
| Digits |
3 1/2 |
3 1/2 |
| Readings |
Gauss, Tesla, Amps/Meters |
Gauss, Tesla, Amps/Meters |
| Analog Output |
- |
+/-3 V PS |
| Comunications Port |
- |
USB |
| Temperature |
Operating |
0°C to 50°C |
0°C to 50°C |
| Storage |
-25°C to 70 °C |
-25°C to 70 °C |
| Power |
4 AA batteries |
4 AA batteries |
| Size |
175x100xH=36 mm |
175x100xH=36 mm |
| Weigth |
0,5Kg |
0,5Kg |
| Trasversal probe 4 " included |
STH17-0404 |
STD18-0404 |
| OPTIONAL: |
| Trasversal probe 4 " |
HTH17-0604 |
HTD18-0604 |
| Trasversal probe 2 " |
STH17-0402 |
STD18-0402 |
| Axial probe 4" |
SAH17-1904 |
STD18-1904 |
| Axial probe 2" |
SAH17-1902 |
SAD18-1902 |
Ultra thin trasversal probe(0,020")
the same for 5170/5180 |
STB1X-0201 |
STB1X-0201 |
| Low field probe the same for 5170/5180 |
MOS51-3204 |
MOS51-3204 |
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DG series 6000
| FEATURES |
| -Display in gauss, tesla or ampere/meters |
| -Peack Hold, Max/Min Hold |
| -Large Format LCD, dual 3 3/4 digita readouts |
| -Rechargeable battery |
| -Temperature measurement (-40°C to + 100°C) |
| -RS - 232 interface, Corrected Analog Output |
-Auto Range/Auto zero/Auto-calibration
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| APPLICATIONS |
| -magnetic testing and classifying |
| -DC and AC motor testing |
| -magnetic field testing |
| -residual field testing |
| -relay and solenoid testing |
| -on line production |
| -research laboratories |
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| PROBES & ACCESSORIES |
| -matching with more than 50 Hall probes (axial and transverse) |
hall probes
hall probes ultra thin |
| GAUSSMETER DG 6010 |
| SPECIFICATIONS |
| Ranges |
300µT, 300mT, 30mT, 300mT, 3T, 30T/3G,30G, 300G, 3Kg, 30Kg, 300Kg |
| Resolution |
1 mG (0,1 µ T) to 100 G (10 mT) |
| Measuring type |
AC/DC (20 kHz rms) |
| Frequency range AC |
0,25% |
DC ± 0,25%
AC ± 1% (20Hz-1000 Hz);
±5%(1 kHz- 2 kHz) |
Temperature
Coefficent |
23°C±5°C |
| Analog output voltage |
± 3 Volt full scale
(for each range) |
| Analog output DC accuracy |
± 0,5% full scale |
| Analog output AC accuracy |
± 2,0% full scale (tipically) |
| Analog terminal |
standard BNC |
| Measure |
tesla, gauss, amper/meter (switch) |
| Power supply AC |
210/2/5 V AC or 105/125 V AC or battery (12V)
(8 hours rechargeable) |
| Display |
intelligent |
| Digits |
33/4 digital LCD |
| Serial output |
RS 232 |
| Auto-Calibration |
yes |
| Peak indicator |
AC/DC |
| Working temperature |
0° - 50 °C |
| Storage temperature |
0°; - 70 °C |
| Weight |
3,5 kg |
| Size |
250 x 115 x H320 mmm |
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DG series 7000
| FEATURES |
| -displays in gauss or tesla |
| -automatic probe coefficient correction |
| -technical support |
| -peak hold |
| -Steady state (DC) or alternating (AC) fields can be measured |
| -available in 3 configurations capable of processing a single channel up to three channels |
| -fully menu-driven for ease of operation |
| -auto zero / auto calibration |
| -IEEE 488 and RS-232 interface (optional) |
| -relative mode |
| APPLICATIONS |
| -magnetic testing and classifying |
| -DC and AC motor testing |
| -magnetic field testing |
| -residual field testing |
| -relay and solenoid testing |
| -on line production |
| -research laboratories |
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| PROBES & ACCESSORIES |
| -matching with more than 70 Hall probes (axial and trasverse) |
| -extension cables available |
| -external zero gauss chamber |
| -expansion channels |
hall probes |
| GAUSSMETERS |
| SPECIFICATIONS DG 7010 DG 7030 |
| Ranges |
300 mG (3µT); 3 G (300 µT); 30 G (3 mT); 300 G (30 mT); 3 kG (300 mT); 30 kG (3 T); 300 kG (30 T) - depending on probe's accuracy |
| Resolution |
1 µG (0,001 µ T) to 1000 G (100 mT) |
| Measuring type |
DC/AC (max 50 kHz rms) |
| Frequency range |
DC to 400 Hz /AC 10 Hz to 50 kHz |
| Accuracy |
DC 0,05% / AC ± 1% of reading |
DC 0,05% / AC ± 2% of reading |
| Analog output voltage |
± 3 V full scale |
| Analog output accuracy |
DC ±0,1% / AC ±1% of range |
DC ±0,25% / AC ±2% of range |
| Analog terminal |
standard BNC connector |
| Measure |
tesla, gauss (switch) |
| Power supply AC |
100/120 V or 200/240 V |
| Display |
1/4 VGA, 320 X 240 pixel, electroluminescent graphic display |
| Digits |
4 ¾ |
| Serial output (optional) |
RS 232 standard 9-pin "D" connector |
| GPIB output (optional) |
IEEE 488 standard 24-pin connector |
| Peak indicator |
AC/DC |
| Temperature coefficient |
±(0,02% of reading ± 1 count)/°C |
| Working temperature |
0° to + 50 °C |
| Storage temperature |
-20° C to + 60 °C |
| Weight |
9 kG |
| Size |
415 x 345 x 135 mmm |
DG 7010
DG 7030
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MG-4D Hand-Held Gaussmeter
The MG-4D is a fully portable hand-held Hall effect gaussmeter designed as a true self-contained instrument for DC and AC (RMS) magnetic field measurements.
Light and small in size, the MG-4D provides the operator with both the convenience of hand-held portability and the accuracy associated with laboratory instruments.
Three full-scale bipolar ranges of ±100 Gauss, ±1 kilogauss and ±10 kilogauss with 100% over-range and resolution of 0.05% provides DC and AC field readings from ±0.1 Gauss to ±19.99 kilogauss (1X probe) with true RMS readings from 10 Hz to 20 kHz; readings are displayed on a 3½ digit ±0.1% bipolar LCD meter.
The MG-4D is a Hall effect instrument and uses a Hall Probe to couple with and measure the magnetic field. A wide selection of precalibrated transverse and axial Hall probes is available to meet most applications. The measuring range of this instrument can be extended to 150 kilogauss with select probes.
Standard features include batteries, carrying case, and a 6' extension probe cable.
An optional battery eliminator allows AC operation. Alkaline batteries can also be replaced with "AA" rechargeable batteries.
Download a printable Product Sheet for the MG-4D
Features
- 3½ digit 0.1% bipolar display
- DC and AC fields, ±100 mGauss to ±19.99 kilogauss with 1X probes
- Range extendable to 150 kilogauss with select probes
- True RMS readings to 20 kHz
- 6' probe extension cable: Standard
- Wide selection of precalibrated probes: 1X, 10X, and 100X
- Operates up to one year with standard "AA" alkaline batteries
- Optional battery eliminator
- Vinyl carrying pouch: Standard
- High impact plastic case
- One year warranty
- Analog Output
Applications
- Measure residual fields
- Analyze magnetic circuits and components
- Classify magnets
- Measure absolute and differential fields
- Plot field uniformity
- Measure stray & leakage fields
Specifications
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Range
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±100 Gauss
±1 kGauss
±10 kGauss
with 100% over-range
(±100 mGauss to ±19.99 kGauss)
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Resolution
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with 100% over-range
(±100 mGauss to 100 Gauss range)
(±1 Gauss to 1 kGauss range)
(±10 Gauss to 10 kGauss range)
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Analog
Output
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±100 mV with 100% over-range (black)
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Display
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3½ digit ±0.1% bipolar LCD
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Range Setting
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DC Accuracy Full Scale
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100 Gauss
1 kGauss
10 kGauss
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0.1%
0.1%
0.1%
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Range Setting
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RMS Accuracy 1% to Full Scale
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100 Gauss
1 kGauss
10 kGauss
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±1% 10 Hz - 10 kHz, ±10%, -20 Hz (5%-100% F.S.)
±1% 10 Hz - 10 kHz, ±2%, -20 Hz (1%-100% F.S.)
±1% 10 Hz - 10 kHz, ±2%, -20 Hz (1%-100% F.S.)
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Power:
6 V - 4 "AA" 1.5 Alkaline Batteries - Standard
Battery Life:
Exceeds 16 hours continuous operation with fully charged batteries
Optional:
Battery eliminator: 105 V - 257 V/50-60 Hz; charge rate 5 mA
Physical (Less Probe):
Size: 2.125" H x 3.63" W x 6.13" L (5.4cm H x 9.2cm W x 15.6cm L)
Net Weight: 14 oz (0.4 kg)
Shipping Weight: 1.5 lbs (0.7 kg)
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Instrumentation » CURRENT METER
CURRENT METER MV 01
The meter has a resolution of 1A (10A) and it catches the first current peak during measuring.
During the parameters setup, the instrument must be adjusted according to "di / dt" of the pulse shape, the error that could appear, depends on these parameters.
The meter is equipped with a measure system for the magnetization voltage.
| Applications |
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current peak checking
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SPECIFICATIONS CURRENT METER MV 01
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display
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4-1/2 digits
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precision
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1%
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resolution
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1A(10A)
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range
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20000 A (200000 A) |
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parameters setting
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flashing |
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serial output
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programmable RS232
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BNC output
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analogic 0-2 V
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comparator
|
2 min/max
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comparator output
|
NOPEN |
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voltage
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0 - 3000 V
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dimensions
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rack 19" 4 HE
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Instrumentation » REFERENCE MAGNETS and MAGNETIC POLE FINDER
Magnetic Pole Detector
Point this palm-sized detector at your magnet and press the button—the red light indicates north, the green light indicates south. Operation is completely electronic, eliminating demagnetization. Unit has a sensitivity of ±150 gauss, is 5 1/2" Lg. x 1" Wd., and is powered by four 1.5-volt batteries (included).
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POLARITY DETECTOR
| POLARITY DETECTOR FEATURES |
-pocket detector revealing the magnet's polarity
-complete of leather casing |
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Laboratory Standard Reference Magnets
Precision References for Accurate Magnetic Calibration
Laboratory Standard Reference Magnets from Walker Scientific provide a convenient and reliable means of verifying the calibration of magnetic measuring instruments such as gaussmeters, fluxmeters and their respective sensors.
Transverse units have an extra-large aperture to accommodate a wide selection of Hall probes and search coils. Both Transverse and Axial units provide an extra-large area of field uniformity, which makes instrument and sensor calibration easy and accurate by allowing fast and precise probing of the reference magnet's peak field.
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Features
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- High stability permanent magnets have been selected which are preaged and screened to reduce instability caused by extreme temperature variation, careless handling and accidental exposure to strong external magnetic fields.
- Monolithic construction has been used to enhance temperature stability and insure that long-term calibration accuracy will not be affected by day-to-day handling.
- Heavy duty shielding is used to reduce stray fields that might be generated from within the magnet and reduce the effect of external fields that are generated outside the magnet, which might otherwise affect the magnet's calibration.
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MAGNETIC SENSITIVE FILM
The magnetic sensitive film is a micro-encapsulated film which enables the user to view a static magnetic field such as commonly emitted by permanent magnets or dc electromagnets. Simply placing the film directly on the surface of the magnetic material in question can instantly reveal a magnetic field of any shape or pattern as well as the poles number. By placing it on a magnet, the neutral areas are revealed, that means the polarity inversions North-Souoth and vice-versa. The neutral areas are white coloured, while the poles are darker (more darker than the film's colour)
The highly flexible film easily conforms to magnetic surfaces with any degree of convexity or concavity.
The film is sensitive to 50 Gauss( 5mT) or higher magnetic field.
It is available in two formats:50x50 mm (PDL-50) - 90x100 mm (PDL-100)
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